Southwestern Puerto Rico out 10NM Marine Forecast
| Today...East Winds Around 5 Knots, Becoming Northwest Around 5 Knots Late. Seas Around 2 Feet. Wave Detail: Northwest 1 Foot At 6 Seconds. Isolated Showers Early This Afternoon. Isolated Showers And Thunderstorms Late. |
| Tonight...Northeast Winds Around 5 Knots, Becoming East After Midnight. Seas Around 2 Feet. Wave Detail: Northwest 2 Feet At 9 Seconds. |
| Sunday...Southeast Winds Around 5 Knots, Becoming Southwest In The Afternoon. Seas Around 2 Feet. Wave Detail: North 2 Feet At 10 Seconds. Scattered Showers In The Afternoon. |
| Sunday Night...Southeast Winds Around 5 Knots. Seas 2 To 3 Feet, Occasionally To 4 Feet. Wave Detail: Northwest 2 Feet At 12 Seconds. Scattered Showers In The Evening. |
| Monday...Southeast Winds 5 To 10 Knots. Seas 2 To 3 Feet, Occasionally To 4 Feet. Wave Detail: Northwest 2 Feet At 11 Seconds. Scattered Showers In The Afternoon. |
| Monday Night...Southeast Winds 5 To 10 Knots. Seas 2 To 3 Feet, Occasionally To 4 Feet. Wave Detail: Northwest 2 Feet At 10 Seconds And South 1 Foot At 2 Seconds. |
| Tuesday...Southeast Winds Around 10 Knots. Seas 2 To 3 Feet, Occasionally To 4 Feet. |
| Tuesday Night...Southeast Winds Around 10 Knots. Seas 2 To 3 Feet, Occasionally To 4 Feet. |
| Wednesday...Southeast Winds 10 To 15 Knots. Seas 2 To 3 Feet, Occasionally To 4 Feet. Scattered Showers In The Afternoon. |
| Wednesday Night...Southeast Winds Around 10 Knots. Seas 2 To 3 Feet, Occasionally To 4 Feet. Winds And Seas Higher In And Near Thunderstorms. |
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Area Forecast Discussion National Weather Service San Juan PR 452am AST Sat Oct 5 2024 Synopsis Another variable weather day will prevail for the local islands, with passing showers across the northeastern sections of Puerto Rico and the surrounding waters. Similar conditions will continue for several days, with warm temperatures leading to heat indices between 102-108°F. Hazardous marine conditions will persist due to northeasterly and east swells generated by the distant Hurricane Kirk in the Central Atlantic. As a result, there is a high risk of rip currents and several small craft advisories in effect. For more detailed information, visit www.weather.sju/marine. .SHORT TERM...Today through Monday... Once again, the Doppler Radar detected scattered to numerous showers mainly across the islands' surrounding waters, with occasional showers moving inland across the US Virgin Islands and the windward sections of PR. Winds were calm to light and variable with a northeasterly component. Although some stations reported lows in the mid-70s across some urban and coastal sites, generally speaking, low temperatures were in the upper 70s or low 80s along the coastal sections and the upper 60s or low 70s in mountain areas. Shower activity may reduce during the morning, and the heat indices will slowly increase. Then, by the afternoon, we expect that the instability provided by the proximity of an upper-level trough will boost the effects of the sea breeze fluctuations, local effects, and excessive diurnal heating to result in strong thunderstorms across the interior, spreading to the rest of the coastal sites. The light steering winds are identified as one of the principal contributors to the elevated risk of flooding today. A passing mid-to-upper-level trough will allow better instability throughout the weekend as the ridges continue moving westward away from the islands. The distant Kirk continues modulating the local weather, as is pooling moisture over us and indirectly influencing the local winds. Today's surface winds will be mainly light from the northeast to north, shifting from the east-southeast on Sunday and becoming southerly around Tuesday. As Kirk interacts with another surface low across the Central Atlantic, a col area will position near the Northeast Caribbean, promoting the light or calm winds across the region. Under this weather pattern, we can expect slow- moving showers and even more threatening afternoon thunderstorms, which may enhance the threat of flooding each day. Additionally, the abundant moisture combined with the afternoon maximum temperatures will continue to promote the unpleasant hot heat indices in areas with no rain activity, especially across the urban and coastal areas of PR and the USVI. Long Term Tuesday through Saturday... An interesting surface pattern will dominate the first part of the long-term period, with a weak surface low-pressure system well to the south in the Caribbean waters and a weak surface ridge over the Central Atlantic. The interaction between these two features will produce a variable and light east-to-southeast wind flow across the region through at least Friday. Under this influence, abundant tropical moisture with PWAT (Precipitable Water) near 2.0 inches is expected from Tuesday through Wednesday. Sufficient moisture will be present from Thursday into Sunday, though it will gradually decrease as the week progresses. Despite tropical moisture being trapped at the surface up to 700 MB on Tuesday and Wednesday, widespread shower activity is not anticipated due to the lack of instability at 250 MB and warmer temperatures at 500 MB of -4°C. As a result, residents can expect a typical pattern of warm morning temperatures followed by afternoon showers, especially across the mountains. The combination of light and variable winds with surface conditions may lead to longer periods of showers and significant rainfall accumulations, potentially causing urban and small stream flooding. Similar conditions will continue through Friday, although shower activity should be less widespread. Global model guidance for 925 MB temperatures suggests a warm period for much of the region due to the southeasterly wind component and the presence of tropical moisture, which will increase relative humidity at 850-700 MB. Consequently, periods of warm temperatures and high moisture levels could result in heat indices near the threshold for heat advisories, increasing health risks for vulnerable communities, particularly in coastal and urban areas. Please follow health department recommendations to avoid heat- related illnesses. Marine Hazardous marine conditions will persist through the weekend and into the upcoming workweek due to a combination of long-period north-northeast to northeast swells affecting regional waters. A weak high-pressure system over the western Atlantic, combined with Hurricane Kirk in the Central Atlantic, will support light to gentle north-to-northeast winds across local waters. Localized hazardous marine conditions are expected near thunderstorm activity, particularly during the afternoon near coastal areas of Puerto Rico. Beach Forecast A high risk of rip currents will be in effect this weekend for most northern beaches of Puerto Rico, Culebra, and St. Croix. Long-period swells from Hurricane Kirk will sustain dangerous coastal conditions throughout the weekend, especially today and tonight. Beachgoers and water sports enthusiasts are urged to exercise extreme caution, as rip currents pose a significant danger along the northern and eastern coasts of Puerto Rico and nearby islands. .SJU WATCHES/WARNINGS/ADVISORIES... PR...High Rip Current Risk through Sunday afternoon for PRZ001-002- 005-008-012. VI...High Rip Current Risk through Sunday afternoon for VIZ002. AM...Small Craft Advisory until midnight AST Sunday night for AMZ711. Small Craft Advisory from midnight tonight to midnight AST Sunday night for AMZ712. |
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